8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=84acd003, *pmd=df292003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 7884 Comm: syz.1.909 Not tainted 6.15.0-rc5-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at io_ring_buffers_peek+0x24/0x258 io_uring/kbuf.c:227 LR is at io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343 pc : [<8088956c>] lr : [<80889cb0>] psr: 20000013 sp : dfbaddc0 ip : dfbade08 fp : dfbade04 r10: 00012361 r9 : 00000000 r8 : 85436900 r7 : 8582690c r6 : 85826900 r5 : dfbade44 r4 : 84c25540 r3 : 00000001 r2 : 8582690c r1 : dfbade44 r0 : 84c25540 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85436640 DAC: 00000000 Register r0 information: slab io_kiocb start 84c25540 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfbac000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85826900 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 84c25540 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfbac000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 85826900 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 85826900 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 85436900 pointer offset 0 size 64 Register r9 information: NULL pointer Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfbac000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfbac000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.1.909 (pid: 7884, stack limit = 0xdfbac000) Stack: (0xdfbaddc0 to 0xdfbae000) ddc0: 81a4be54 8030cb0c 8413a100 00000001 00010000 8582690c 00000000 84c25540 dde0: dfbade44 85826900 8582690c 00000000 80000001 00012361 dfbade1c dfbade08 de00: 80889cb0 80889554 8505f400 84c25540 dfbade84 dfbade20 808931e0 80889c54 de20: dfbade4c dfbade30 8089ec2c 8050a4c4 00010001 00000001 8057abbc 00000000 de40: 00000000 8582690c 00000000 00000000 00010001 790ffd08 80886a40 84c25540 de60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 83a58c00 dfbadebc dfbade88 de80: 80886bd8 80892f38 84c25180 84c25000 84c250c0 8413a000 84c255ac 84c25540 dea0: 856e0000 00000000 00000000 83a58c00 dfbadf14 dfbadec0 808877a8 80886b7c dec0: 8088e164 81a4bdf8 dfbadf24 dfbaded8 00000800 00000800 81cf0b5c 00000800 dee0: 8413a000 790ffd08 84df10c0 00000042 8413a000 00003517 84df10c0 00000000 df00: 83a58c00 00000000 dfbadfa4 dfbadf18 80888250 808875a8 ecac8b10 8413a040 df20: 00000000 0000173d 81a4fbd0 81a4faa0 dfbadf54 dfbadf40 8026b438 8029ce1c df40: dfbadfb0 40000000 dfbadf84 dfbadf58 802229dc 8026b3f4 00000000 8281d05c df60: dfbadfb0 0014c490 ecac8b10 80222930 00000000 790ffd08 dfbadfac 00000000 df80: 00000000 002e630c 000001aa 8020029c 83a58c00 000001aa 00000000 dfbadfa8 dfa0: 80200060 80888124 00000000 00000000 00000003 00003517 0000173d 00000042 dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b350bc dfe0: 76b34ec0 76b34eb0 0001939c 00131f30 60000010 00000003 00000000 00000000 Call trace: [<80889548>] (io_ring_buffers_peek) from [<80889cb0>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00012361 r9:80000001 r8:00000000 r7:8582690c r6:85826900 r5:dfbade44 r4:84c25540 [<80889c48>] (io_buffers_peek) from [<808931e0>] (io_recv_buf_select io_uring/net.c:1077 [inline]) [<80889c48>] (io_buffers_peek) from [<808931e0>] (io_recv+0x2b4/0x46c io_uring/net.c:1138) r5:84c25540 r4:8505f400 [<80892f2c>] (io_recv) from [<80886bd8>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline]) [<80892f2c>] (io_recv) from [<80886bd8>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759) r10:83a58c00 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:84c25540 [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_queue_sqe io_uring/io_uring.c:1975 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqe io_uring/io_uring.c:2231 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2348) r10:83a58c00 r9:00000000 r8:00000000 r7:856e0000 r6:84c25540 r5:84c255ac r4:8413a000 [<8088759c>] (io_submit_sqes) from [<80888250>] (__do_sys_io_uring_enter io_uring/io_uring.c:3408 [inline]) [<8088759c>] (io_submit_sqes) from [<80888250>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3342) r10:00000000 r9:83a58c00 r8:00000000 r7:84df10c0 r6:00003517 r5:8413a000 r4:00000042 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbadfa8 to 0xdfbadff0) dfa0: 00000000 00000000 00000003 00003517 0000173d 00000042 dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b350bc dfe0: 76b34ec0 76b34eb0 0001939c 00131f30 r10:000001aa r9:83a58c00 r8:8020029c r7:000001aa r6:002e630c r5:00000000 r4:00000000 Code: e1a08002 e5912000 e50b2030 e1a05001 (e1d920be) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e1a08002 mov r8, r2 4: e5912000 ldr r2, [r1] 8: e50b2030 str r2, [fp, #-48] @ 0xffffffd0 c: e1a05001 mov r5, r1 * 10: e1d920be ldrh r2, [r9, #14] <-- trapping instruction